Ratnajit Bhattacharjee

IIT Guwahati

Matched Feed Design for Offset Reflector Antennas

Abstract: Parabolic reflector antennas are used in many applications such as satellite communication, radio astronomy, radars, etc. The offset parabolic antennas offer certain advantages such as reduced aperture blockage and high isolation between the feed and the reflector as compared to their axisymmetric counterpart. However, one disadvantage of offset reflector antenna is the high cross-polar level in the asymmetric plane of the reflector pattern when F/D of such reflector becomes smaller. Low F/D is desirable in many applications. The cross-polarization levels can be reduced for such antennas through the use of matched feed. For circularly polarized offset reflector antenna, beam squint problem can also be tackled using matched feed. Design of matched feed has got a lot of attention of the research community. Apart from multimode horn and waveguide based matched feed, microstrip antenna and array based matched feed structures have also been investigated. This talk will highlight some of the recent developments in the field of matched feed design and also present some of the works carried out by the research groups of the speaker in this field.

Ratnajit Bhattacharjee is a Professor in the Department of Electronics and Electrical Engineering, IIT Guwahati. His research interests include Wireless communication, Wireless networks, Microstrip antennas, Microwave Engineering and Electromagnetics. He has co-authored about one hundred and forty research papers. Thirteen research students have completed their PhD under his supervision. He has served as General Chair for 5th edition of IEEE Applied Electromagnetic Conference, AEMC 2015 and 22nd National Conference on Communications, NCC 2016; Chairman for the 18th National Power System Conference, NPSC 2014 and National symposium on Vacuum Electronic Devices and Applications VEDA-2018. He has also served as Convener for the conference IESC 2017 (Innovations in Electronics, Signal Processing and Communication, IESC 2017). He has delivered invited talks in a number of conferences, symposia and workshops. He has also been involved with several projects. Presently he is the Chief Coordinator for Ministry of Electronics and Information Technology (MeitY) sponsored project for setting up of an Electronics & ICT academy at IIT Guwahati.

He holds a Ph.D (Engineering) from Jadavpur University, Kolkata and an M.Tech (Microwave Engineering) from IIT Kharagpur. He did his B.E. in Electronics and Telecommunication Engineering (First Class Hons) from REC Silchar.

Reiner Stuhlfauth


5G NR technology aspects and status – what are the test and measurements challenges for a successful deployment of 5G NR?

Abstract: In this presentation a short introduction into the technology aspects of 5G NR will be presented. Special focus will be on the test and measurement challenges, like over the air testing aspects and higher frequency and higher bandwidth implementation. An outlook will be given on how to analyze 5G NR signals in the field.

Reiner Stuhlfauth is a Technology Manager Wireless working in the technology management team of Rohde&Schwarz in Munich. He is responsible for teaching and promoting mobile communication technologies, especially cellular standards like: GSM, (E)GPRS, UMTS, HSPA, LTE, LTE-Advanced and 5G NR, but also non-cellular technologies such as WLAN and Bluetooth. He is also involved in a number of projects concerning 5G, the next mobile communication technology.

In his role, he links development and sales organisations to coordinate implementation of technical features into R&S instruments and interactively discusses new requirements with R&S customers.

Reiner is one of the authors who have published a technology book on 5G NR: “5G New Radio - Fundamentals, procedures, testing aspects”